161290355226 has 128 divisors (see below), whose sum is σ = 434916421632. Its totient is φ = 38510208000.

The previous prime is 161290355207. The next prime is 161290355227. The reversal of 161290355226 is 622553092161.

It is a happy number.

It is a super-2 number, since 2×161290355226² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (161290355227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1391731 + ... + 1503161.

It is an arithmetic number, because the mean of its divisors is an integer number (3397784544).

Almost surely, 2^161290355226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161290355226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217458210816).

161290355226 is an abundant number, since it is smaller than the sum of its proper divisors (273626066406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161290355226 is a wasteful number, since it uses less digits than its factorization.

161290355226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111708.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 161290355226 in words is "one hundred sixty-one billion, two hundred ninety million, three hundred fifty-five thousand, two hundred twenty-six".